FREE DOWNLOAD : REAPER User Guide v3.06C by Geoffrey Francis (13MB PDF, over 400 pages)
http://www.cockos.com/reaper/userguide.php
Want a hard copy? Buy via Lulu (Paperback)
The essential and definitive guide to recording, editing and mixing with REAPER. Now fully updated for version 3.06. Includes sample project files and step by step examples to help you learn how to use the many features of REAPER.
Includes special sections on key REAPER features such as routing and audio channel splitting, as well as numerous examples of how to use and apply many of the supplied FX plug-ins.